Is the player trying to hit the ball too hard? I always worked on the mantra "Accuracy before Power". Once they improve on accuracy they can add the power.

Does the player practice realistic shooting in training? Consider overloaded shooting practice (eg 2 attackers vs 1 defender + GK or 3v2+GK) from realistic distances. 

1 attacker plays in and joins in. The 2 (or 3) combine to get a shot off. There should be enough pressure from the Defender (or 2) to make it realistic but also sufficient room for the 2 (or 3) attackers to create shooting opportunities.

Serve the ball in from different angles and distances rather than everything central. You can add a time limit (depending on age), say, 6/7 seconds to combine and get a shot off if they take too long to set up a shooting chance (to you, to me, to you etc)

Keep reiterating the point you make that not every striker scores every time they shoot. Ask them to reflect on why they have missed - stretching for the ball, kicking under the ball, not making a good contact (sometimes it's just about getting a good surface contact to redirect the ball). If they can self assess, then the question is, so what do you have to do differently to get it on target (you may have to help them with this depending on their age and experience)?

Keep shooting when you have the opportunity - "you won't score from 100% of the shots you don't take"

Shooting and missing is merely a learning experience. Consider the miss but focus on the next chance.

Also, the practice described above, with a change of emphasis can be used for shot stopping for GKs, defending outnumbered for defenders, or quick combination play and shooting from in and around the box.

Hope this helps

Is the player trying to hit the ball too hard? I always worked on the mantra "Accuracy before Power". Once they improve on accuracy they can add the power.

Does the player practice realistic shooting in training? Consider overloaded shooting practice (eg 2 attackers vs 1 defender + GK or 3v2+GK) from realistic distances. 

1 attacker plays in and joins in. The 2 (or 3) combine to get a shot off. There should be enough pressure from the Defender (or 2) to make it realistic but also sufficient room for the 2 (or 3) attackers to create shooting opportunities.

Serve the ball in from different angles and distances rather than everything central. You can add a time limit (depending on age), say, 6/7 seconds to combine and get a shot off if they take too long to set up a shooting chance (to you, to me, to you etc)

Keep reiterating the point you make that not every striker scores every time they shoot. Ask them to reflect on why they have missed - stretching for the ball, kicking under the ball, not making a good contact (sometimes it's just about getting a good surface contact to redirect the ball). If they can self assess, then the question is, so what do you have to do differently to get it on target (you may have to help them with this depending on their age and experience)?

Keep shooting when you have the opportunity - "you won't score from 100% of the shots you don't take"

Shooting and missing is merely a learning experience. Consider the miss but focus on the next chance.

Also, the practice described above, with a change of emphasis can be used for shot stopping for GKs, defending outnumbered for defenders, or quick combination play and shooting from in and around the box.

Hope this helps

Some great advice here Stephen. There are definitely aspects around the below:

Coaching points: Technique related to ball striking. Approach to the ball, surface of foot, non-kicking foot placement, follow through on contact etc.

Practice design: Outnumbered (as mentioned above) but other considerations worth noting; distance to goal in finishing practices and number of repetitions. Most goals are scored within the box (regardless of age) - do your practices mirror this distance? You may look to create a challenge rather than a time limit to finish, use a certain number of balls per round. i.e 10 shots/balls per round. This may become challenging for a player, BUT it may also demand the player to focus more on the above coaching points?

Positive reinforcement: Add your specific coaching points to positive comments. Players will then be more likely to perform your coaching points when being praised specifically for them, especially around finishing. Players will also link your praise to a specific action i.e striking through the ball. 

Hope the above helps and compliments some greats ideas on this thread.

Lloyd